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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Atomic Emission Spectroscopy: Overview01:20

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Baseline-free wavelength modulation spectroscopy based on cepstral analysis.

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    A new wavelength modulation spectroscopy (WMS) m-FID technique offers accurate, baseline-free measurements. This method, based on cepstral analysis, accelerates combustion analysis significantly.

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    Area of Science:

    • Spectroscopy
    • Combustion diagnostics
    • Physical chemistry

    Background:

    • Accurate in situ monitoring of combustion gases is crucial for understanding and controlling combustion processes.
    • Existing techniques like Wavelength Modulation Spectroscopy (WMS) and Direct Absorption Spectroscopy (DAS) have limitations in accuracy, speed, or baseline stability.
    • The development of novel spectroscopic methods is essential for advancing combustion research and applications.

    Purpose of the Study:

    • To introduce and validate a new Wavelength Modulation Spectroscopy - molecular Free-Induction Decay (WMS m-FID) technique.
    • To demonstrate the technique's capability for quantitative, accurate, and baseline-free measurements in both static gas cells and high-temperature flames.
    • To evaluate the computational efficiency and robustness of the WMS m-FID approach compared to established methods.

    Main Methods:

    • Development of a WMS m-FID technique incorporating cepstral analysis with WMS and modified time-domain m-FID signals.
    • Theoretical framework and fitting routine investigation for the WMS m-FID technique.
    • Validation experiments using a static CO gas cell and a premixed CH4/Air laminar flame on a flat-flame burner.
    • Comparison with Direct Absorption Spectroscopy (DAS) and WMS-2f/1f techniques.

    Main Results:

    • The WMS m-FID technique achieved fitting errors <1.0% and relative uncertainty of 0.17% in static CO measurements.
    • In a CH4/Air flame, the technique yielded temperature (1763 K) and H2O concentration (16.58%) with low uncertainties (30 K and 0.65%, respectively).
    • The WMS m-FID approach demonstrated a 22-fold acceleration in computational efficiency and achieved strictly baseline-free CO measurements.

    Conclusions:

    • The proposed WMS m-FID technique provides quantitative, accurate, and baseline-free measurements.
    • The technique is robust and reliable for both static and dynamic combustion environments.
    • WMS m-FID offers a significant improvement in computational efficiency, making it a promising tool for in situ combustion monitoring.